CN105856345B - The manufacture method of low resin added environmental protection laminated veneer lumber - Google Patents
The manufacture method of low resin added environmental protection laminated veneer lumber Download PDFInfo
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- CN105856345B CN105856345B CN201610206058.0A CN201610206058A CN105856345B CN 105856345 B CN105856345 B CN 105856345B CN 201610206058 A CN201610206058 A CN 201610206058A CN 105856345 B CN105856345 B CN 105856345B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
- B27D1/08—Manufacture of shaped articles; Presses specially designed therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/10—Butting blanks of veneer; Joining same along edges; Preparatory processing of edges, e.g. cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D5/00—Other working of veneer or plywood specially adapted to veneer or plywood
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G11/00—Applying adhesives or glue to surfaces of wood to be joined
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/0015—Treating of wood not provided for in groups B27K1/00, B27K3/00 by electric means
- B27K5/002—Electric discharges, plasma
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1284—Application of adhesive
Abstract
The present invention is the manufacture method of low resin added environmental protection laminated veneer lumber, belongs to wood-based plate manufacturing technology field.Its technique is that juggle is peeled into 2~5mm Wooden veneers, the dry moisture content that adjusts is to 2~6%, to its two-sided carry out Low Temperature Plasma Treating after veneer Lengthwise joint, acted synergistically by ultrasound and cyclone, adhesive atomization is sprayed on tight side for diameter less than 40 μm of particles, single side adhesive applied amount is 20~100g/m2, by lumber fibre grain direction rift grain assembly, low resin added environmental protection laminated veneer lumber is then made using High frequency heating.Properties of product meet laminated veneer lumber requirements of the national standard, and burst size of methanal reaches E0Level requires, and the more traditional gluing mode dosage of adhesive dosage declines 30~70%, and product quality is obviously improved, and production cost is decreased obviously.In addition this method energy-saving production technology environmental protection, production equipment is easy to operate, efficient, controllability is good, and can continuous and automatic operation.
Description
Technical field
The present invention relates to a kind of manufacture method of low resin added environmental protection laminated veneer lumber.Belong to wood-based plate manufacturing technology neck
Domain.
Background technology
Laminated veneer lumber (LVL) is that one kind utilizes small diameter grade log, through rotary-cut, drying, gluing, veneer rift grain assembly, glue
Close a kind of new structure material formed.LVL not only remain timber natural characteristic (as natural texture color and luster, it is good
Machining property etc.), but also the design feature not possessed with solid sawn lumber, the natural defect of timber by random dispersion,
Make LVL Strength Variances small, allowable stress is high, and good stability of the dimension, veneer rift grain gluing significantly improves the longitudinal strength of product,
Thus, LVL products can be used as construction material, such as door, the frame material of window, I-beam, the support of wall.In addition, LVL also can use
Make Furniture manufacture material, such as table, chair leg material, and other industrial cut stocks, such as electric pole.
Compared with normal plywood, since veneer thickness used in laminated veneer lumber is thick compared with veneer used in normal plywood, rotation
More crack is inevitably formed when cutting thick veneer in loose side, for that can be formed on veneer surface when ensureing and being glued
Even continuous glue-line, when being glued using traditional roller gluing method, usual LVL adhesives amount ratio normal plywood institute expense
Height, general single spreading amount are 200~250g/m2, meanwhile, because the number of plies of LVL is several times even tens of normal plywood
Times, so adhesive cost accounts for more than the 1/3 of LVL total production costs, it is seen then that adhesive dosage size is to production cost
Significantly affected with quality.
At present, China's Wood industry is faced with that the prices of raw materials rise steadily, labor cost is continuously increased, product ring
The severe situation that guaranteed cost index request is continuously improved, developing low-cost high-quality laminated veneer lumber product becomes keeps China
The competitiveness of laminated veneer lumber product in the international market, promotes the upgrading of China's laminated veneer lumber industrial transformation, realizes sustainable
The hot research problem of development.In face of such severe situation, it is to reduce laminated veneer lumber life that adhesive dosage, which is greatly reduced,
Produce cost and improve product quality (the particularly free formaldehyde release of product) effective method.
The content of the invention
The purpose of the present invention is being modified processing to Wooden veneer surface using atmospheric low-temperature plasma, in wooden list
High reaction activity superficial layer of the plate surface structure with special nanoscale indentation, while cooperateed with using ultrasound with cyclone atomization
Effect, subparticle is atomized into by glue, is uniformly sprayed in Wooden veneer surface, is utilized the veneer surface after plasma modification
High wettability glue is quickly flowed exhibition automatically, veneer surface formed uniformly continuous thin adhesive layer, realize it is micro sizing (glue
The glutinous more traditional gluing mode dosage of agent dosage declines 30~70%) efficient glued purpose under mode between timber and adhesive,
The requirement that physical and mechanical property meets laminated veneer lumber national standard is prepared, and free formaldehyde release reaches E0Level requires
Low resin added environmental protection laminated veneer lumber.
The technical solution of the present invention：The manufacture method of low resin added environmental protection laminated veneer lumber is to complete according to the following steps
's：
First, prepared by Wooden veneer：
It is prepared by Wooden veneer：Log cutting into lengths, then softened processing are then first peelled off into tree to improve timber plasticity
Skin, determines the juggle rotary-cut centre of gyration, finally stand-by after drying through being peeled into Wooden veneer；
The thickness of Wooden veneer described in step 1 is 2~5mm, since the too low dry energy consumption of Wooden veneer moisture content is big,
Moisture content it is excessive carry out surface plasma processing when easily produce punch-through, therefore, after drying, Wooden veneer it is aqueous
Rate is controlled 2~6%；Since Wooden veneer is thicker, to prevent that wood shrinkage causes veneer buckling deformation in drying process, at the same time
Ensure drying efficiency, it is predrying first to carry out jet to Wooden veneer with roller dryer or mesh-belt drier, then uses hot plate
Drying machine under the conditions of certain pressure by Wooden veneer drying to target moisture content scope, the control of press drying pressure 0.1~
0.3MPa；
2nd, Wooden veneer spreading：
Wooden veneer Lengthwise joint：By dried veneer after the processing of edging in length and breadth, at the both ends of veneer length direction
Mill out inclined-plane, slope 1: 6 to 1: 12 coats urea-formaldehyde resin adhesive on the inclined-plane of veneer one end, dosage for 100~
120g/m2, cure the adhesive at inclined-plane by heating in single-plate lengthening machine is put in after the inclined-plane docking of two veneers, heating temperature
Spend for 100~120 DEG C, veneer is along timber rift grain direction Lengthwise joint；
3rd, Wooden veneer surface preparation：
Carry out atmospheric low-temperature plasma modification two-sided to Wooden veneer, by the electronics in plasma, ion,
Corrasion and free radical of the high energy active particle such as atom, molecule and photon to Wooden veneer surface trigger chemistry to make
With, change Wooden veneer surface microstructure, and a large amount of polar groups are introduced on its surface, form with special nanometer ruler
The high reaction activity superficial layer of indentation is spent, adhesive is greatly improved in Wooden veneer wettability of the surface, it is wooden to realize
Efficient gluing of the veneer in the case of low resin added lays the foundation；
Wooden veneer surface atmospheric low-temperature plasma modification processing method described in step 3 is：Wooden veneer is placed in
On the low-temperature plasma modified and micro sizing integrated apparatus feeding web of wooden thin plate, according to processed Wooden veneer
Thickness adjusts four pairs and encourages double-dielectric barrier discharge electrode spacing with diamond spar ceramic coated difference, its value range is 5~10mm,
Power supply is opened, processing power is adjusted to 3~6KW, the air between electrode is produced low-temperature plasma by dielectric barrier discharge
Body, makes Wooden veneer vacantly pass sequentially through the gap among upper and lower four pairs of sparking electrodes with the speed of 2~40m/min, in normal pressure
Low-temperature plasma modified processing is carried out at the same time to two surfaces of Wooden veneer under state, and since Wooden veneer leads to successively
Four pairs of electrodes are crossed, processing four times is sequentially overlapped equivalent to same processed position, the surface for enhancing Wooden veneer is modified effect
Fruit；
4th, the micro sizing in Wooden veneer surface：
Acted synergistically by ultrasound and cyclone, glue atomization is sprayed in Wooden veneer for particle of the diameter less than 40 μm
Tight face, i.e., there is no the veneer surface for surmounting crack, Wooden veneer single side adhesive applied amount to control in 20~100g/m2, depending on
Depending on different adhesive species, the more conventional dosage of adhesive dosage reduces 30~70%；
The micro glue applying method in Wooden veneer surface described in step 4 is：Adhesive is pumped by glue and is inputted with stabilized speed
Ultrasonic cyclone is atomized glue system, by the Wooden veneer after atmospheric low-temperature plasma is handled with 2~40m/min and normal pressure
By glue system, one layer of thin glue-line is uniformly at the uniform velocity sprayed on its surface for the speed of Low Temperature Plasma Treating systems compliant,
It is 42 ± 3KHz to control ultrasonic cyclone atomization glue system working frequency, and power is 1~5W, flow 1-50mL/min, nozzle and
The distance on Wooden veneer surface is 200-400mm, air pressure 0.01-0.1MPa；
Ultrasound and the cooperative effect of cyclone can make adhesive atomization be fine particle, and this tiny adhesive particle can lead to
Cross Wooden veneer surface and wood cell wall is penetrated into by the nanoscale indentation of plasma etching, closely connect with cell wall substance
Touch, form nanometer mechanics and be fitted together to or be connected chemically with component of polymer generation in cell membrane, form the polymeric web to interpenetrate
Network, so that the efficient gluing in the case of can realizing low resin added between timber and adhesive；
Adhesive used in the micro sizing in Wooden veneer surface described in step 4 is cyanurotriamide modified urea resin glue, phenol
One kind in urea formaldehyde glue and isocyanate glue, should be less than to ensure that adhesive is smoothly atomized for fine particle, its viscosity
40s, is preferably controlled in 20~30s；
Step 3 and step 4 are completed by the low-temperature plasma modified and micro sizing integrated apparatus of wooden thin plate,
The device includes device framework, wooden thin plate transmission assembly, Power Component, Low Temperature Plasma Treating component, ultrasonic cyclone spray
Glue component and controller assemblies, Wooden veneer (including are set in turn on device framework by transmission assembly along feedstock direction
Wooden thin plate charging conveyor, wooden thin plate charging sensing device, wooden thin plate charging pressure roller, wooden thin plate discharging pressure roller, wood
Matter thin plate discharging sensing device and wooden thin plate discharging transmission roller group) deliver into Low Temperature Plasma Treating；Low-temperature plasma
Body processing component (encourages double-dielectric barrier discharge electrode, low-temperature plasma generator, low temperature plasma electricity comprising four pairs of difference
Source and cooling row ozone equipment) in low-temperature plasma electrical source and low-temperature plasma generator pass through high insulated wire with electrode
Cable is reliably connected, and the electric discharge acquisition uniform low temperature plasma of wide cut between electrode gap, Wooden veneer is vacantly by between electrode
Gap, two surfaces are carried out at the same time low-temperature plasma modified processing；Wooden veneer after Low Temperature Plasma Treating is discharging
Enter ultrasonic cyclone glue spraying region under the drive of pressure roller, ultrasonic cyclone glue spraying component (including ultrasonic cyclone synergistic effect nozzle branch
Support stent, ultrasonic cyclone synergistic effect nozzle, glue control valve, pipeline-cleaning valve, adhesive collection device and glue spraying taste removal dress
Put) in ultrasonic cyclone synergistic effect nozzle be fixed on by stainless steel slide block Parallel Symmetric on nozzle support stent, stainless steel
Sliding block adjustable nozzles and the distance on wooden thin plate surface, so that the glue for regulating and controlling every group of nozzle sprays area, to realize regulation and control
The purpose of Wooden veneer top sizing amount, the adjustable range of nozzle and wooden thin plate surface distance is 200-400mm, and nozzle leads to
Cross snorkel to be connected with admission pressure device, it is 0.01-0.1MPa to adjust the air pressure of admission pressure device, is atomized adhesive, together
When control nozzle operation 42 ± 3KHz of frequency, power be 1~5W, and generation ultrasonic wave makes glue particle further refine diameter to be less than
40 μm of particle, adjusting range of flow are 1-50mL/min, recycle the Wooden veneer surface after Low Temperature Plasma Treating
The fine glue that high wettability makes to spray in its surface drips rapid stream exhibition, and realizing can form in the case of low resin added on veneer surface
One layer of uniform thin adhesive layer, so that the product after gluing obtains good bonding strength；Power Component can adjust transmission speed,
Ensure veneer in Low Temperature Plasma Treating region and the uniformity of the movement velocity of ultrasonic cyclone size application area；
5th, Wooden veneer assembly is glued：
Wooden veneer after sizing is subjected to assembly according to lumber fibre grain direction rift grain, is then suppressed using high frequency heat
Low resin added environmental protection laminated veneer lumber is obtained, the physical and mechanical property of the plate meets the requirement of laminated veneer lumber national standard, and
Free formaldehyde release reaches E0Level requires；
Wooden veneer Wooden veneer slab High frequency heating process conditions described in step 5 are：Hot pressing temperature is 140~180
DEG C, hot pressing pressure is 1.4~1.8MPa, and hot pressing time is 0.05~0.1min/mm, and working frequency is 5~14MHz, and anode is electric
It is 4: 1~7: 1 to flow for 2~3A, anode current and grid current ratio.Using High frequency heating, using the effect of electromagnetic field of high frequency,
Heat is produced by the dielectric material inside slab in itself, converts electrical energy into thermal energy, the heat transfer effect of slab is greatly improved
Rate, shortens hot pressing time, significantly improves productivity.
Advantages of the present invention：(1) superior product quality：A kind of low resin added environmental protection laminated veneer lumber provided using this patent
The laminated veneer lumber product physical and mechanical property for preparing of manufacture method meet the requirement of laminated veneer lumber national standard, i.e.,
It is non-E to make adhesive used0Level cyanurotriamide modified urea resin glue, because gluing dosage used is few, the free first of product
Aldehyde burst size can also be up to state standards defined E0Level requires.(2) production cost is low：Wooden veneer is through atmospheric low-temperature etc.
Using ultrasonic cyclone collaboration atomization glue spraying after gas ions modification, product can be made in the more conventional adhesive dosage of adhesive dosage
In the case of declining 30~70%, performance still can performance reach the requirement of relevant national standard, so as to which production is greatly lowered
Cost.(3) energy-saving production technology environmental protection：A kind of manufacture method for low resin added environmental protection laminated veneer lumber that this invention provides,
Dry process technique, saves the energy, nuisanceless, meets the requirement of current industrial metaplasia production energy saving and emission reduction.(4) production equipment operation letter
Just：Can be according to the requirement of product by adjusting treatment process control process effect, and processing time is short, efficient, controllability is good,
And can continuous and automatic operation.
Embodiment
Embodiment 1
Path quick growth poplar wood is truncated into certain length juggle with circular sawing machine, juggle is put in boiling pond and is carried out at softening
Reason, increases timber plasticity, to improve rotary cut venner quality., need to be with special peeling machine by wood in order to ensure laminated veneer lumber quality
Section bark removes.Then, the centre of gyration of juggle is determined using mechanical centering machine, then juggle is positioned over peeler with overwood machine
On, the veneer that thickness is 2mm is made in rotary-cut.
Board using poplar board is first put in mesh-belt drier carry out jet it is predrying, be then put in breather drier
It is dried under 0.2MPa pressure conditions, drying temperature is unsuitable excessive, controls below 80 DEG C, prevents veneer in drying process
Buckling deformation, to ensure the flatness of veneer.It is after drying that the moisture control of board using poplar board is stand-by 4%.
By dried board using poplar board after the processing of edging in length and breadth, inclined-plane, slope are milled out at the both ends of veneer length direction
For 1: 6, urea-formaldehyde resin adhesive, dosage 100g/m are coated on the inclined-plane of veneer one end2, the inclined-plane of two veneers is docked
Being put in single-plate lengthening machine heating afterwards makes the adhesive at inclined-plane cure, and heating-up temperature is 110 DEG C, and veneer is along timber rift grain direction
Lengthwise joint.
Veneer after spreading is placed in the charging of the low-temperature plasma modified and micro sizing integrated apparatus of wooden thin plate
On conveyer belt, Low Temperature Plasma Treating region is entered under the drive of charging pressure roller, adjusting four sparking electrodes up and down
Spacing is 6mm.Low-temperature plasma electrical source is opened, processing power is adjusted to 4.5KW, when interelectrode voltage reaches atmospherical discharges
During voltage, dielectric barrier discharge is formed between electrode, produces low temperature plasma, board using poplar board is hanged successively with the speed of 2m/min
Sky is continued through from four pairs of electrode gaps, and low-temperature plasma modified processing is carried out at the same time to two surfaces above and below veneer.It is wooden
Veneer passes sequentially through four pairs of electrodes, is sequentially overlapped processing four times equivalent to same processed position, enhances Wooden veneer
Surface low-temperature plasma modification effect.
By the E that viscosity is 20s1Level cyanurotriamide modified urea resin glue with stabilized speed input wooden thin plate low temperature etc. from
Daughter is modified and the ultrasonic cyclone atomization glue system of micro sizing integrated apparatus.Start the adjustment air pressure of admission pressure device
0.1MPa, is atomized adhesive, while control system working frequency is 42 ± 3KHz, power 3W, and producing ultrasonic wave makes glue
The particle that diameter is less than 40 μm is further refined as, it is 20mL/min, nozzle and wood to adjust glue control valve adjustment mist flow
The spacing on matter veneer surface is 200mm, and control board using poplar board is consistent with atmospheric low-temperature plasma processing system with 2m/min
Speed is at the uniform velocity by glue system, and in the tight face of board using poplar board, (i.e. there is no the veneer surface for surmounting crack) uniformly sprays one layer
Thin glue-line, the resin added of Wooden veneer single side is 100g/m2.Wooden veneer after sizing is suitable by lumber fibre grain direction
Line assembly, is then 140 DEG C, hot pressing pressure 1.4MPa, hot pressing time 0.05min/mm in hot pressing temperature, working frequency is
Under conditions of being 4: 1 by High frequency heating veneer is made in 6.78MHz, anode current 2A, anode current and grid current ratio
Laminated timber.The glue performance and burst size of methanal of laminated veneer lumber see the table below.
Embodiment 2
It is 2mm that path quick growth poplar wood is made thickness by the identical step of embodiment 1, and moisture content is 4% veneer.Will be dry
Board using poplar board after dry mills out inclined-plane, slope 1: 6, in veneer at the both ends of veneer length direction after the processing of edging in length and breadth
Urea-formaldehyde resin adhesive, dosage 100g/m are coated on the inclined-plane of one end2, connect veneer is put in after the inclined-plane docking of two veneers
Heating makes the adhesive at inclined-plane cure in leader, and heating-up temperature is 110 DEG C, and veneer is along timber rift grain direction Lengthwise joint.
Veneer after spreading is placed in the charging of the low-temperature plasma modified and micro sizing integrated apparatus of wooden thin plate
On conveyer belt, Low Temperature Plasma Treating region is entered under the drive of charging pressure roller, adjusting four sparking electrodes up and down
Spacing is 6mm.Low-temperature plasma electrical source is opened, processing power is adjusted to 4.5KW, when interelectrode voltage reaches atmospherical discharges
During voltage, form dielectric barrier discharge between electrode, produce low temperature plasma, board using poplar board with the speed of 10m/min successively
Vacantly continued through from four pairs of electrode gaps, low-temperature plasma modified processing is carried out at the same time to two surfaces above and below veneer.
By the E that viscosity is 20s1Level cyanurotriamide modified urea resin glue with stabilized speed input wooden thin plate low temperature etc. from
Daughter is modified and the ultrasonic cyclone atomization glue system of micro sizing integrated apparatus.Start the adjustment air pressure of admission pressure device
0.1MPa, is atomized adhesive, while control system working frequency is 42 ± 3KHz, power 3W, and producing ultrasonic wave makes glue
The particle that diameter is less than 40 μm is further refined as, it is 20mL/min, nozzle and wood to adjust glue control valve adjustment mist flow
The spacing on matter veneer surface is 200mm, and control board using poplar board is consistent with atmospheric low-temperature plasma processing system with 10m/min
Speed is at the uniform velocity by glue system, and in the tight face of board using poplar board, (i.e. there is no the veneer surface for surmounting crack) uniformly sprays one layer
Thin glue-line, the resin added of Wooden veneer single side is 80g/m2.Wooden veneer after sizing is suitable by lumber fibre grain direction
Line assembly, is then 140 DEG C, hot pressing pressure 1.4MPa, hot pressing time 0.05min/mm in hot pressing temperature, working frequency is
Under conditions of being 4: 1 by High frequency heating veneer is made in 6.78MHz, anode current 2A, anode current and grid current ratio
Laminated timber.The glue performance and burst size of methanal of laminated veneer lumber see the table below.
Comparative example 1
It is 2mm that path quick growth poplar wood is made thickness by the identical step of embodiment 1, and moisture content is 4% veneer.Will be dry
Board using poplar board after dry mills out inclined-plane, slope 1: 6, in veneer at the both ends of veneer length direction after the processing of edging in length and breadth
Urea-formaldehyde resin adhesive, dosage 100g/m are coated on the inclined-plane of one end2, connect veneer is put in after the inclined-plane docking of two veneers
Heating makes the adhesive at inclined-plane cure in leader, and heating-up temperature is 110 DEG C, and veneer is along timber rift grain direction Lengthwise joint.
Veneer after spreading is used into roller gluing mode by E by current laminated veneer lumber production technology1Level melamine
Modified urea-formaldehyde resin glue is applied to two surface of core plate, and the resin added of Wooden veneer single side is 200g/m2.By the Wooden veneer after sizing
It it is then 140 DEG C, hot pressing pressure 1.4MPa in hot pressing temperature, hot pressing time is by lumber fibre grain direction rift grain assembly
Under conditions of 0.05min/mm, working frequency 6.78MHz, anode current 2A, anode current and grid current ratio are 4: 1
Laminated veneer lumber is made by High frequency heating.The glue performance and burst size of methanal of laminated veneer lumber see the table below.
Comparative example 2
It is 2mm that path quick growth poplar wood is made thickness by the identical step of embodiment 1, and moisture content is 4% veneer.Will be dry
Board using poplar board after dry mills out inclined-plane, slope 1: 6, in veneer at the both ends of veneer length direction after the processing of edging in length and breadth
Urea-formaldehyde resin adhesive, dosage 100g/m are coated on the inclined-plane of one end2, connect veneer is put in after the inclined-plane docking of two veneers
Heating makes the adhesive at inclined-plane cure in leader, and heating-up temperature is 110 DEG C, and veneer is along timber rift grain direction Lengthwise joint.
Veneer after spreading is used into roller gluing mode by E by current laminated veneer lumber production technology1Level melamine
Modified urea-formaldehyde resin glue is applied to two surface of core plate, and the resin added of Wooden veneer single side is 180g/m2.By the Wooden veneer after sizing
It it is then 140 DEG C, hot pressing pressure 1.4MPa in hot pressing temperature, hot pressing time is by lumber fibre grain direction rift grain assembly
Under conditions of 0.05min/mm, working frequency 6.78MHz, anode current 2A, anode current and grid current ratio are 4: 1
Laminated veneer lumber is made by High frequency heating.The glue performance and burst size of methanal of laminated veneer lumber see the table below.
Embodiment 3
It is 3mm that masson pine log is made thickness by the identical step of embodiment 1, and moisture content is 4% veneer.By drying
Board using poplar board afterwards mills out inclined-plane, slope 1: 10, in veneer one at the both ends of veneer length direction after the processing of edging in length and breadth
Urea-formaldehyde resin adhesive, dosage 120g/m are coated on the inclined-plane at end2, veneer lengthening will be put in after the inclined-plane docking of two veneers
Heating makes the adhesive at inclined-plane cure in machine, and heating-up temperature is 110 DEG C, and veneer is along timber rift grain direction Lengthwise joint.
Veneer after spreading is placed in the charging of the low-temperature plasma modified and micro sizing integrated apparatus of wooden thin plate
On conveyer belt, Low Temperature Plasma Treating region is entered under the drive of charging pressure roller, adjusting four sparking electrodes up and down
Spacing is 10mm.Low-temperature plasma electrical source is opened, processing power is adjusted to 4.5KW, is put when interelectrode voltage reaches air
During piezoelectric voltage, form dielectric barrier discharge between electrode, produce low temperature plasma, plate of Pinus massoniana with the speed of 2m/min according to
It is secondary vacantly to be continued through from four pairs of electrode gaps, low-temperature plasma modified processing is carried out at the same time to two surfaces above and below veneer.
By the E that viscosity is 20s1Level cyanurotriamide modified urea resin glue with stabilized speed input wooden thin plate low temperature etc. from
Daughter is modified and the ultrasonic cyclone atomization glue system of micro sizing integrated apparatus.Start the adjustment air pressure of admission pressure device
0.1MPa, is atomized adhesive, while control system working frequency is 42 ± 3KHz, power 3W, and producing ultrasonic wave makes glue
The particle that diameter is less than 40 μm is further refined as, it is 20mL/min, nozzle and wood to adjust glue control valve adjustment mist flow
The spacing on matter veneer surface is 200mm, and control plate of Pinus massoniana is consistent with atmospheric low-temperature plasma processing system with 2m/min
Speed at the uniform velocity by glue system, in the tight face of plate of Pinus massoniana, (i.e. there is no the veneer surface for surmounting crack) uniformly sprays
One layer of thin glue-line, the resin added of Wooden veneer single side is 100g/m2.Wooden veneer after sizing is pressed into lumber fibre texture
Direction rift grain assembly, is then 140 DEG C, hot pressing pressure 1.6MPa, hot pressing time 0.1min/mm in hot pressing temperature, work
Frequency is 6.78MHz, anode current 2A, and anode current and grid current ratio are suppressed under conditions of being 4: 1 by high frequency heat
Into laminated veneer lumber.The glue performance and burst size of methanal of laminated veneer lumber see the table below.
Comparative example 3
It is 3mm that masson pine log is made thickness by the identical step of embodiment 1, and moisture content is 6% veneer.By drying
Board using poplar board afterwards mills out inclined-plane, slope 1: 10, in veneer one at the both ends of veneer length direction after the processing of edging in length and breadth
Urea-formaldehyde resin adhesive, dosage 120g/m are coated on the inclined-plane at end2, veneer lengthening will be put in after the inclined-plane docking of two veneers
Heating makes the adhesive at inclined-plane cure in machine, and heating-up temperature is 110 DEG C, and veneer is along timber rift grain direction Lengthwise joint.
Veneer after spreading is used into roller gluing mode by E by the production technology of current laminated veneer lumber1Level melamine
Amine modified urea-formaldehyde resin glue is applied to two surface of core plate, and the resin added of Wooden veneer single side is 250g/m2.By the wooden list after sizing
Plate presses lumber fibre grain direction rift grain assembly, is then 140 DEG C, hot pressing pressure 1.6MPa in hot pressing temperature, hot pressing time
For 0.1min/mm, working frequency 6.78MHz, anode current 2A, anode current and the condition that grid current ratio is 4: 1
Laminated veneer lumber is made by High frequency heating down.The glue performance and burst size of methanal of laminated veneer lumber see the table below.
Because Masson pine timber contains abundant resin canal, it is peeled into resin after veneer and can separates out and be covered in veneer surface,
The presence of this oleoresin has seriously affected the glue performance at timber interface.If not carrying out necessary processing to veneer surface,
Only it can just make properties of product up to standard reluctantly by improving adhesive dosage.Using the art of this patent, to plate of Pinus massoniana surface
Low Temperature Plasma Treating is carried out, the structure of its surface oleoresin can be destroyed, substantially increase adhesive on veneer surface
Wetability, so as to ensure that (single side resin added is 100g/m in relatively low resin added2) in the case of, plate of Pinus massoniana still can be real
The gluing of existing high intensity.
Embodiment 4
It is 3mm that path quick growth poplar wood is made thickness by the identical step of embodiment 1, and moisture content is 6% veneer.Will be dry
Board using poplar board after dry mills out inclined-plane, slope 1: 10, in veneer at the both ends of veneer length direction after the processing of edging in length and breadth
Urea-formaldehyde resin adhesive, dosage 120g/m are coated on the inclined-plane of one end2, connect veneer is put in after the inclined-plane docking of two veneers
Heating makes the adhesive at inclined-plane cure in leader, and heating-up temperature is 110 DEG C, and veneer is along timber rift grain direction Lengthwise joint.
Veneer after spreading is placed in the charging of the low-temperature plasma modified and micro sizing integrated apparatus of wooden thin plate
On conveyer belt, Low Temperature Plasma Treating region is entered under the drive of charging pressure roller, adjusting four sparking electrodes up and down
Spacing is 10mm.Low-temperature plasma electrical source is opened, processing power is adjusted to 4.5KW, is put when interelectrode voltage reaches air
During piezoelectric voltage, form dielectric barrier discharge between electrode, produce low temperature plasma, board using poplar board with the speed of 10m/min according to
It is secondary vacantly to be continued through from four pairs of electrode gaps, low-temperature plasma modified processing is carried out at the same time to two surfaces above and below veneer.
It is low-temperature plasma modified and micro apply that phenolic resin glue that viscosity is 30s with stabilized speed is inputted into wooden thin plate
The ultrasonic cyclone atomization glue system of glue integrated apparatus.Start admission pressure device adjustment air pressure 0.1MPa, make adhesive mist
Change, while control system working frequency is 42 ± 3KHz, power 3W, it is small that generation ultrasonic wave makes glue be further refined as diameter
In 40 μm of particle, it is 20mL/min to adjust glue control valve adjustment mist flow, and nozzle and the spacing on Wooden veneer surface are
200mm, control board using poplar board are at the uniform velocity by being glued with speed consistent with atmospheric low-temperature plasma processing system 10m/min
System, in the tight face of board using poplar board, (i.e. there is no the veneer surface for surmounting crack) uniformly sprays one layer of thin glue-line, Wooden veneer
The resin added of single side is 90g/m2.Wooden veneer after sizing is pressed into lumber fibre grain direction rift grain assembly, then in hot pressing
Temperature is 180 DEG C, hot pressing pressure 1.8MPa, hot pressing time 0.1min/mm, working frequency 6.78MHz, and anode current is
Under conditions of being 4: 1 by High frequency heating laminated veneer lumber is made in 2A, anode current and grid current ratio.Laminated veneer lumber
Glue performance and burst size of methanal see the table below.
Comparative example 4
It is 3mm that path quick growth poplar wood is made thickness by the identical step of embodiment 1, and moisture content is 6% veneer.Will be dry
Board using poplar board after dry mills out inclined-plane, slope 1: 10, in veneer at the both ends of veneer length direction after the processing of edging in length and breadth
Urea-formaldehyde resin adhesive, dosage 120g/m are coated on the inclined-plane of one end2, connect veneer is put in after the inclined-plane docking of two veneers
Heating makes the adhesive at inclined-plane cure in leader, and heating-up temperature is 110 DEG C, and veneer is along timber rift grain direction Lengthwise joint.
Veneer after spreading is used into roller gluing mode by phenolic resin glue by the production technology of current laminated veneer lumber
Two surface of core plate is applied to, the resin added of Wooden veneer single side is 200g/m2.Wooden veneer after sizing is pressed into lumber fibre texture
Direction rift grain assembly, is then 180 DEG C, hot pressing pressure 1.8MPa, hot pressing time 0.1min/mm in hot pressing temperature, work
Frequency is 6.78MHz, anode current 2A, and anode current and grid current ratio are suppressed under conditions of being 4: 1 by high frequency heat
Into laminated veneer lumber.The glue performance and burst size of methanal of laminated veneer lumber see the table below.
Comparative example 5
It is 3mm that path quick growth poplar wood is made thickness by the identical step of embodiment 1, and moisture content is 6% veneer.Will be dry
Board using poplar board after dry mills out inclined-plane, slope 1: 10, in veneer at the both ends of veneer length direction after the processing of edging in length and breadth
Urea-formaldehyde resin adhesive, dosage 120g/m are coated on the inclined-plane of one end2, connect veneer is put in after the inclined-plane docking of two veneers
Heating makes the adhesive at inclined-plane cure in leader, and heating-up temperature is 110 DEG C, and veneer is along timber rift grain direction Lengthwise joint.
Veneer after spreading is used into roller gluing mode by phenolic resin glue by the production technology of current laminated veneer lumber
Two surface of core plate is applied to, the resin added of Wooden veneer single side is 180g/m2.Wooden veneer after sizing is pressed into lumber fibre texture
Direction rift grain assembly, is then 180 DEG C, hot pressing pressure 1.8MPa, hot pressing time 0.1min/mm in hot pressing temperature, work
Frequency is 6.78MHz, anode current 2A, and anode current and grid current ratio are suppressed under conditions of being 4: 1 by high frequency heat
Into laminated veneer lumber.The glue performance and burst size of methanal of laminated veneer lumber see the table below.
Embodiment 5
It is 3mm that path quick growth poplar wood is made thickness by the identical step of embodiment 1, and moisture content is 6% veneer.Will be dry
Board using poplar board after dry mills out inclined-plane, slope 1: 10, in veneer at the both ends of veneer length direction after the processing of edging in length and breadth
Urea-formaldehyde resin adhesive, dosage 120g/m are coated on the inclined-plane of one end2, connect veneer is put in after the inclined-plane docking of two veneers
Heating makes the adhesive at inclined-plane cure in leader, and heating-up temperature is 110 DEG C, and veneer is along timber rift grain direction Lengthwise joint.
Veneer after spreading is placed in the charging of the low-temperature plasma modified and micro sizing integrated apparatus of wooden thin plate
On conveyer belt, Low Temperature Plasma Treating region is entered under the drive of charging pressure roller, adjusting four sparking electrodes up and down
Spacing is 10mm.Low-temperature plasma electrical source is opened, processing power is adjusted to 4.5KW, is put when interelectrode voltage reaches air
During piezoelectric voltage, form dielectric barrier discharge between electrode, produce low temperature plasma, board using poplar board with the speed of 30m/min according to
It is secondary vacantly to be continued through from four pairs of electrode gaps, low-temperature plasma modified processing is carried out at the same time to two surfaces above and below veneer.
The carbimide that viscosity is 30s is inputted into the low-temperature plasma modified and micro sizing of wooden thin plate with stabilized speed
The ultrasonic cyclone atomization glue system of integrated apparatus.Start admission pressure device adjustment air pressure 0.1MPa, be atomized adhesive,
Control system working frequency be 42 ± 3KHz, power 3W at the same time, and generation ultrasonic wave makes glue be further refined as diameter to be less than
40 μm of particle, it is 20mL/min to adjust glue control valve adjustment mist flow, and nozzle and the spacing on Wooden veneer surface are
200mm, control board using poplar board are at the uniform velocity by being glued with speed consistent with atmospheric low-temperature plasma processing system 30m/min
System, in the tight face of board using poplar board, (i.e. there is no the veneer surface for surmounting crack) uniformly sprays one layer of thin glue-line, Wooden veneer
The resin added of single side is 20g/m2.Wooden veneer after sizing is pressed into lumber fibre grain direction rift grain assembly, then in hot pressing
Temperature is 180 DEG C, hot pressing pressure 1.8MPa, hot pressing time 0.1min/mm, working frequency 6.78MHz, and anode current is
Under conditions of being 4: 1 by High frequency heating laminated veneer lumber is made in 2A, anode current and grid current ratio.Laminated veneer lumber
Glue performance and burst size of methanal see the table below.
Laminated veneer lumber physical and mechanical property measurement result see the table below：
Note：
1. glue kind：MUF is E1Level cyanurotriamide modified urea resin glue, PF is phenolic resin glue, and MDI is carbimide tree
Fat；
2. dipping and stripping presses national standard《Laminated veneer lumber》GB/T 20241-2006 are measured, and MUF laminated veneer lumbers are by non-
Structural veneer laminated timber requires measure, PF laminated veneer lumbers and MDI laminated veneer lumbers to be measured by the requirement of structural veneer laminated timber, root
According to the requirement of standard GB/T/T 20241-2006, the dipping and stripping of non-structural laminated veneer lumber requires the same glue-line of test specimen
Any side tree lace strip length is no more than the 1/3 of the side tree lace length, and the dipping and stripping of structural veneer laminated timber requires test specimen 4
Peel off 5% that total length is no more than glue-line total length, and any glue-line strip length in side (strip length less than 3mm is disregarded)
No more than the 1/4 of the sum of four side of glue-line；
3. the horizontal shear strength of structural veneer laminated timber presses national standard《Laminated veneer lumber》GB/T 20241-2006 are surveyed
It is fixed, according to the requirement of standard GB/T/T 20241-2006.
Claims (8)
1. the manufacture method of low resin added environmental protection laminated veneer lumber, it is characterised in that：The low resin added environmental protection laminated veneer lumber
Material is prepared according to the following steps：
Step 1：It is prepared by Wooden veneer：First log cutting into lengths, then softened processing are then peelled off with improving timber plasticity
Bark, determines the juggle rotary-cut centre of gyration, finally stand-by after drying through being peeled into Wooden veneer；
Step 2：Wooden veneer Lengthwise joint：By dried veneer after the processing of edging in length and breadth, the two of veneer length direction
End mill goes out inclined-plane, and slope 1: 6 to 1: 12, urea-formaldehyde resin adhesive is coated on the inclined-plane of veneer one end, by two veneers
Heating in single-plate lengthening machine is put in after inclined-plane docking cures the adhesive at inclined-plane, and veneer longitudinally connects along timber rift grain direction
It is long；
Step 3：Wooden veneer surface preparation：It is low-temperature plasma modified and micro apply that Wooden veneer is placed in wooden thin plate
On glue integrated apparatus feeding web, carry out atmospheric low-temperature plasma modification two-sided to Wooden veneer, by wait from
The corrasion to Wooden veneer surface of electronics, ion, atom, molecule and photon high-energy active particle in daughter and
Free radical triggers chemical action, changes Wooden veneer surface microstructure, and introduces a large amount of polar groups on its surface, forms
High reaction activity superficial layer with special nanoscale indentation, is greatly improved profit of the adhesive on Wooden veneer surface
It is moist, to realize that efficient gluing of the Wooden veneer in the case of low resin added lays the foundation；
Step 4：The micro sizing in Wooden veneer surface：Adhesive is pumped by glue wooden thin plate low temperature etc. is inputted with stabilized speed
The ultrasonic cyclone atomization glue system of the modifies and micro sizing integrated apparatus of ion, is acted synergistically by ultrasound and cyclone,
Adhesive atomization is sprayed in the tight face of Wooden veneer for particle of the diameter less than 40 μm, i.e., there is no the veneer table for surmounting crack
Face, Wooden veneer single side adhesive applied amount are controlled in 20~100g/m2；
Step 5：Wooden veneer assembly is glued：Wooden veneer after sizing is subjected to group according to lumber fibre grain direction rift grain
Base, is then made low resin added environmental protection laminated veneer lumber using High frequency heating, and the physical and mechanical property of the laminated veneer lumber meets
The requirement of laminated veneer lumber national standard, and free formaldehyde release reaches E0Level requires；Wherein, step 3 and step 4 are logical
Cross the low-temperature plasma modified and micro sizing integrated apparatus of wooden thin plate to complete, which includes device framework, wooden thin
Plate transmission assembly, Power Component, Low Temperature Plasma Treating component, ultrasonic cyclone glue spraying component and controller assemblies；Wooden list
Plate delivers into Low Temperature Plasma Treating by transmission assembly；Wooden veneer after Low Temperature Plasma Treating is in transmission group
Entering ultrasonic cyclone glue spraying region under the drive of part, the glue of the ultrasonic controllable every group of nozzle of cyclone glue spraying component sprays area,
So as to regulate and control Wooden veneer top sizing amount；Using low-temperature plasma modified processing in Wooden veneer surface construction with special
Nanoscale indentation high reaction activity superficial layer, while using ultrasound with cyclone atomization cooperative effect, glue is atomized into
Subparticle, uniformly sprays and quickly flows exhibition automatically in Wooden veneer surface, glue, and the thin glue of uniformly continuous is formed on veneer surface
Layer, realizes micro sizing.
2. the manufacture method of low resin added environmental protection laminated veneer lumber according to claim 1, it is characterised in that：Step 1 institute
The thickness for the Wooden veneer stated is 2~5mm, through jet is predrying and press drying after, the moisture control of Wooden veneer 2~
6%, press drying pressure is controlled in 0.1~0.3MPa.
3. the manufacture method of low resin added environmental protection laminated veneer lumber according to claim 1, it is characterised in that：Step 2 institute
During the Wooden veneer Lengthwise joint stated, urea-formaldehyde resin adhesive dosage is 100~120g/m2, heating-up temperature is 100~120 DEG C.
4. the manufacture method of low resin added environmental protection laminated veneer lumber according to claim 1, it is characterised in that：Step 3 institute
The Wooden veneer surface atmospheric low-temperature plasma modification processing method stated is：By Wooden veneer be placed in wooden thin plate low temperature etc. from
Daughter is modified with micro sizing integrated apparatus feeding web, and four pairs are adjusted with steel according to the thickness of processed Wooden veneer
Beautiful ceramic coated difference encourages double-dielectric barrier discharge electrode spacing, its value range is 5~10mm, unlatching power supply, at adjusting
Power is managed to 3~6KW, the air between electrode is produced low temperature plasma by dielectric barrier discharge, makes Wooden veneer with 2
The speed of~40m/min vacantly passes sequentially through the gap among upper and lower four pairs of sparking electrodes, to Wooden veneer under normal pressure state
Two surfaces be carried out at the same time low-temperature plasma modified processing.
5. the manufacture method of low resin added environmental protection laminated veneer lumber according to claim 1, it is characterised in that：Step 4 institute
The micro glue applying method in Wooden veneer surface stated is：Adhesive is pumped by glue ultrasonic cyclone atomization sizing is inputted with stabilized speed
System, the Wooden veneer after atmospheric low-temperature plasma is handled is handled with 2~40m/min and atmospheric low-temperature plasma
By glue system, one layer of thin glue-line is uniformly at the uniform velocity sprayed on its surface for the speed of systems compliant.
6. the manufacture method of low resin added environmental protection laminated veneer lumber according to claim 4, it is characterised in that：Control ultrasound
Cyclone atomization glue system working frequency is 42 ± 3kHz, and power is 1~5W, flow 1-50mL/min, nozzle and Wooden veneer
The distance on surface is 200~400mm, air pressure 0.01-0.1MPa.
7. the manufacture method of low resin added environmental protection laminated veneer lumber according to claim 1, it is characterised in that：Step 5 institute
The Wooden veneer slab High frequency heating process conditions stated are：Hot pressing temperature is 140~180 DEG C, hot pressing pressure for 1.4~
1.8MPa, hot pressing time are 0.05~0.1min/mm, and working frequency is 5~14MHz, and anode current is 2~3A, anode current
It is 4: 1~7: 1 with grid current ratio.
8. the manufacture method of low resin added environmental protection laminated veneer lumber according to claim 1, it is characterised in that：Step 4 institute
Adhesive used in the micro sizing in Wooden veneer surface stated is cyanurotriamide modified urea resin glue, phenolic resin glue and isocyanic acid
One kind in ester gum, 40s is should be less than to ensure that adhesive is smoothly atomized for fine particle, its viscosity.
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| CN106625907A (en) * | 2016-11-30 | 2017-05-10 | 黄河三角洲京博化工研究院有限公司 | Wood veneer gluing equipment and recombined wood preparation method |
| CN106827162A (en) * | 2017-04-13 | 2017-06-13 | 黄河三角洲京博化工研究院有限公司 | A kind of system and laminated veneer lumber preparation method for preparing laminated veneer lumber as raw material with Wooden veneer |
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Application publication date: 20160817 Assignee: Jiangsu Aike Seth New Material Co. Ltd. Assignor: Nanjing Forestry University Contract record no.: 2019320000051 Denomination of invention: Manufacturing method for low-adhesive-consumption environment-friendly laminated veneer lumber Granted publication date: 20180504 License type: Common License Record date: 20190321 |